Methods and instrumentation for bunch shape measurements

Feschenko, A.V.

doi:10.1109/pac.2001.987557

Cited by 15 publications

(9 citation statements)

References 2 publications

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“…The largest difference from the concept is the last stage. Deflecting the 2.5MeV H − ions would require inconveniently large RF power, and therefore the temporal degree of freedom was instead measured by analyzing the time of arrival of secondary electrons produced when the H − ions strike a tungsten wire in the beam path [21]. Also, in order to reduce the scan time, the last slit was replaced by a luminescent screen and video camera, the linearity and accuracy of which was checked against a Faraday cup, so that the whole temporal profile was measured in one pulse.…”

Section: Fig 1 a Diagram Showing The Principle Behind A Full Six DImentioning

confidence: 99%

First Six Dimensional Phase Space Measurement of an Accelerator Beam

et al. 2018

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Section: Fig 1 a Diagram Showing The Principle Behind A Full Six DImentioning

confidence: 99%

First Six Dimensional Phase Space Measurement of an Accelerator Beam

et al. 2018

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“…The primary motivation for focusing on photons as the secondary particles is to avoid the space charge effects. Additionally both Cherenkov and transition radiation interactions are considered to occur fast in contrast to SE emission, where it was experimentally shown, that the emission time delay does not exceed (4 ± 2) ps [71]. Due to the rather low beam energy at the LBM3 location, there is a concern regarding a sufficient photon yield from transition or Cherenkov radiation.…”

Section: Longitudinal Bunch Profile Monitoring (Lbm)mentioning

confidence: 99%

The European Spallation Source Design

et al. 2017

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The ESS Design: Accelerator 6The ESS Design: Target 66The ESS Design: Controls 93The ESS Design: Conventional Facilities 109Physica ScriptaPhys. Scr. 93 (2018) 014001 (121pp) https://doi.org/10. 1088/1402-4896/aa9bff This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercialNoDerivs 3.0 licence. Content from this work may be used under the terms of the Creative Commons Attribution-NonCommercialNoDerivs 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Neutron scattering is a well-developed and extensively used means to get access to fundamental properties of biological matter as well as of physical materials. Until the end of the twentieth century that was mainly practiced with-and limited in performance by-the continuous flux of neutrons from ageing nuclear reactors (e.g. the Institut Laue-Langevin (ILL), the flagship of neutron research in Europe and in the world) [1]). Looking forward to the following two decades, an OECD report published in 1998 diagnosed the foreseeable decrease of the number of operational facilities [2] and the need to progress in performance. Considering the high scientific interest and the increasing importance of the subject for society at large, the report concluded by strongly recommending the construction of next generation neutron sources in America, Europe and Asia. Pulsed spallation neutron sources (SNS) using a proton beam power exceeding 1 MW were specifically mentioned as the most interesting high performance facilities in the future landscape of neutron laboratories.The USA was the first country to follow this advice by building the SNS in the Oak Ridge National Laboratory (ORNL) which started in 2006 [3, 4]. Japan followed in 2009 with the Japan Proton Accelerator Research Centre (J-PARC) in Tokai [5,6]. In Europe, the subject was part of a concerted effort to further develop the European world-leading largescale research infrastructures suite. In 2003, the European Strategy Forum for Research Infrastructures (ESFRI), set up by the Research Ministries of the Member States and associated countries, concluded that a 5 MW long-pulse, single target station layout with nominally 22 'public' instruments was the optimum technical reference design for an European Spallation Source (ESS) that would meet the needs of the European science community in the second quarter of the century [7].Six years later, in 2009, it materialised in a real project with the adoption of the site of Lund (Sweden). A preconstruction phase followed until the end of 2013 during which the design was finalised [8]. Construction then started with the first neutron beams planned to be available in 2019, and the ESS facility to be operational at full performance in 2025.2 Description 2.1 Principle and specifics. The high level parameters of ESS are shown in table 1. As at SNS and J-PARC, neutrons at ESS are produced by spallation, when the 2 GeV protons hit the meta...

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“…For the measurement of the longitudinal bunch shape a Feschenko monitor [45] was installed behind the cryomodule. The bunch length at HLI output (0.5 ns-0.8 ns) is increased in the long drift line to the bunch shape monitor (see Fig.…”

Section: Beam Matching and First Beam Accelerationmentioning

confidence: 99%

First heavy ion beam tests with a superconducting multigap CH cavity

Barth¹,

Aulenbacher

Basten

et al. 2018

Phys. Rev. Accel. Beams

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Very compact accelerating-focusing structures, as well as short focusing periods, high accelerating gradients and short drift spaces are strongly required for superconducting (sc) accelerator sections operating at low and medium energies for continuous wave (cw) heavy ion beams. To keep the GSI-super heavy element (SHE) program competitive on a high level and even beyond, a standalone sc cw linac (Helmholtz linear accelerator) in combination with the GSI high charge state injector (HLI), upgraded for cw operation, is envisaged. Recently the first linac section (financed by Helmholtz Institute Mainz (HIM) and GSI) as a demonstration of the capability of 217 MHz multigap crossbar H-mode structures (CH) has been commissioned and extensively tested with heavy ion beam from the HLI. The demonstrator setup reached acceleration of heavy ions up to the design beam energy. The required acceleration gain was achieved with heavy ion beams even above the design mass to charge ratio at high beam intensity and full beam transmission. This paper presents systematic beam measurements with varying rf amplitudes and phases of the CH cavity, as well as phase space measurements for heavy ion beams with different mass to charge ratio. The worldwide first and successful beam test with a superconducting multigap CH cavity is a milestone of the R&D work of HIM and GSI in collaboration with IAP in preparation of the HELIAC project and other cw-ion beam applications.

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Methods and instrumentation for bunch shape measurements

Cited by 15 publications

References 2 publications

First Six Dimensional Phase Space Measurement of an Accelerator Beam

First Six Dimensional Phase Space Measurement of an Accelerator Beam

The European Spallation Source Design

First heavy ion beam tests with a superconducting multigap CH cavity

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